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Subtract 4/18 from 7/72

7/72 - 4/18 is -1/8.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 72 and 18 is 72

    Next, find the equivalent fraction of both fractional numbers with denominator 72
  2. For the 1st fraction, since 72 × 1 = 72,
    7/72 = 7 × 1/72 × 1 = 7/72
  3. Likewise, for the 2nd fraction, since 18 × 4 = 72,
    4/18 = 4 × 4/18 × 4 = 16/72
  4. Subtract the two like fractions:
    7/72 - 16/72 = 7 - 16/72 = -9/72
  5. After reducing the fraction, the answer is -1/8

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